[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.817300] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.700035] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.055745] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.754906] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 27.947135] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 33.422429] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 33.508148] BUG: unable to handle kernel paging request at ffffeafff8bc0008 [ 33.515565] IP: [] page_remove_rmap+0x2e/0x260 [ 33.521834] PGD 0 [ 33.524102] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.529160] Dumping ftrace buffer: [ 33.532700] (ftrace buffer empty) [ 33.536395] Modules linked in: [ 33.539705] CPU: 1 PID: 3796 Comm: syz-executor606 Not tainted 4.4.148-gf057ff9 #81 [ 33.547482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.556875] task: ffff8801d2d18000 task.stack: ffff8801d90b0000 [ 33.562918] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.571625] RSP: 0018:ffff8801d90b79c0 EFLAGS: 00010246 [ 33.577061] RAX: dffffc0000000000 RBX: ffffeafff8bc0000 RCX: 0000000000000000 [ 33.584317] RDX: 1ffffd5fff178001 RSI: ffffffff814bc75f RDI: ffffeafff8bc0008 [ 33.591577] RBP: ffff8801d90b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.598835] R10: 0000000000000001 R11: ffff8801d2d18000 R12: 0000000000000001 [ 33.606094] R13: 1ffff1003b216f3e R14: ffff8801cf940800 R15: ffffeafff8bc0000 [ 33.613351] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.621584] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.627504] CR2: ffffeafff8bc0008 CR3: 00000001cea00000 CR4: 00000000001606f0 [ 33.634764] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.642036] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.649295] Stack: [ 33.651429] ffff8801d90b7c50 0000000000000001 ffff8801d90b7a78 ffffffff8150a1f3 [ 33.659485] 00003ffe2f0001e0 00003ffe2f0001e0 0000000041b58ab3 ffffffff841ef82f [ 33.667579] ffffffff81509ff0 00000000000004f0 ffff8801cc5330b0 ffff8801d90b7a40 [ 33.675623] Call Trace: [ 33.678204] [] zap_huge_pmd+0x203/0x510 [ 33.683819] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.690456] [] unmap_single_vma+0xea3/0x1240 [ 33.696505] [] ? vm_normal_page+0x230/0x230 [ 33.702483] [] ? __put_single_page+0x60/0x60 [ 33.708554] [] unmap_vmas+0x81/0xd0 [ 33.713874] [] exit_mmap+0x1c9/0x3a0 [ 33.719227] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.725710] [] ? up_write+0x1a/0x60 [ 33.730978] [] mmput+0xf8/0x2d0 [ 33.735897] [] do_exit+0x8d8/0x26b0 [ 33.741165] [] ? file_map_prot_check+0x193/0x310 [ 33.747577] [] ? release_task.part.17+0x1200/0x1200 [ 33.754283] [] ? SyS_mprotect+0x41e/0x640 [ 33.760080] [] ? up_write+0x1a/0x60 [ 33.765350] [] ? SyS_mprotect+0x423/0x640 [ 33.771186] [] do_group_exit+0x111/0x330 [ 33.776890] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.783370] [] SyS_exit_group+0x1d/0x20 [ 33.788984] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.795567] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 33.823480] RIP [] page_remove_rmap+0x2e/0x260 [ 33.829885] RSP [ 33.833494] CR2: ffffeafff8bc0008 [ 33.836936] ---[ end trace b9c11780c7eaf1e9 ]--- [ 33.841674] Kernel panic - not syncing: Fatal exception [ 33.847650] Dumping ftrace buffer: [ 33.851186] (ftrace buffer empty) [ 33.854886] Kernel Offset: disabled [ 33.858496] Rebooting in 86400 seconds..